Residual chlorine analyzer adopting constant voltage method

The utility model belongs to the technical field of water quality detection, and particularly relates to a residual chlorine analyzer adopting a constant voltage method, which comprises a main body, the top of the main body is connected with a sliding cover in a sliding manner, the inner side of the main body is provided with a clamping groove, a clamping block is arranged below the sliding cover, the clamping block can be clamped with the clamping groove, and the sliding cover is limited on the outer side of the main body. According to the residual chlorine analyzer based on the constant voltage method, a sliding block drives a clamping block to get close to and enter a groove, when the inclined face of the clamping block makes contact with the inner side of the groove, the clamping block can drive the sliding block to slide downwards and gradually enter the groove, the sliding block moves to drive a pressing rod to slide in a sliding cover, and a compression spring is stretched; after the clamping block com